9/11/2001 (United Airlines 93's tragedy)

United Airlines Flight 93 was a scheduled United States domestic passenger flight from Newark International Airport, in Newark, New Jersey, to San Francisco International Airport, in San Francisco, California that was hijacked by four Islamist terrorists as part of the September 11 attacks in 2001. Over forty minutes into the flight the hijackers breached the cockpit, overpowered the pilots, and took over the control of the aircraft, diverting it toward Washington, D.C. Several passengers and crew members made telephone calls aboard the flight and learned about the attacks on the World Trade Center and the Pentagon. As a result, the passengers decided to mount an assault against the hijackers and gain control of the aircraft.
Of the four aircraft hijacked that day, American Airlines Flight 11, American Airlines Flight 77 and United Airlines Flight 175 being the others, United Airlines Flight 93 was the only aircraft that failed to reach its intended target due to the actions of its passengers.

The plane crashed in a field in Stonycreek Township, near Shanksville, in Somerset County, Pennsylvania, about 80 miles (130 km) southeast of Pittsburgh and 150 miles (240 km) northwest of Washington, D.C., killing all on board including 40 passengers and crew and four hijackers. Many witnessed the impact from the ground and news agencies began reporting on the event within an hour. The plane fragmented upon impact, leaving a crater, and some debris was blown miles from the crash site. The remains of everyone on board the aircraft were later identified. Subsequent analysis of the flight recorders revealed how the actions taken by the passengers prevented the aircraft from reaching the hijackers' intended target, thought to be either the White House or United States Capitol. A permanent memorial is planned for construction on the crash site. The chosen design has been the subject of criticism, but the memorial is scheduled to be dedicated in 2011.